<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <ul>
            <li v-for="item in arr" :key="item" >{{item}}</li>
          
            
        </ul>
        <button @click="qh">走一走</button>
    </div>
    <script>
        const app=new  Vue({
            el:'#app',
            data:{
                arr:['帅哥' ,'美女' ,'程序员']
            },
            methods:{
                qh(){
                    this.arr.push(this.arr[0])
                    this.arr.shift()
                }
            }
        })
    </script>
</body>

</html>